Battery cover plate and battery

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises: a cover plate main body provided with a through hole; the welding block penetrates through the through hole, a mounting groove is formed in the welding block, and the mounting groove penetrates through the surface of one side of the welding block in the thickness direction of the battery cover plate; the pole comprises a bottom plate part and an embedded structure which are connected with each other, the embedded structure is arranged in the mounting groove and is welded with the welding block, and the bottom plate part is positioned outside the mounting groove and is suitable for being connected with a tab; the thickness of the bottom plate part is A along the thickness direction of the battery cover plate, and A is more than or equal to 1mm and less than or equal to 1.5 mm. According to the utility model, the bottom plate part of the pole is directly connected with the tab, so that the connection structure is simplified, and the processing procedures are reduced; by limiting the thickness size of the bottom plate part, the space occupation of the bottom plate part in the battery shell is reduced on the premise of ensuring the welding quality of the pole and the tab.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a battery cover plate and a battery. Background Art

[0002] In new energy batteries, the battery cover plate is an important structural component. The battery cover plate can protect the internal structure of the battery from the external environment and physical collisions, ensure the stable operation of the battery in a complex usage environment, and can also prevent the leakage of chemical substances inside the battery, avoiding harm to the environment and the human body.

[0003] In the prior art, the pole column needs to be electrically connected to the pole group through a connecting piece, with many welding processes and a relatively high defective rate of the connection between the pole column and the pole group. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery cover plate and a battery to solve the problems of many welding processes for the electrical connection between the pole column and the pole group and a relatively high defective rate of the connection between the pole column and the pole group.

[0005] In a first aspect, the utility model provides a battery cover plate, including: a cover plate main body, the cover plate main body is provided with a perforation; a welding block, the welding block is arranged through the perforation, the welding block is provided with an installation groove, and along the thickness direction of the battery cover plate, the installation groove penetrates through one side surface of the welding block; a pole column, including a bottom plate portion and an embedding structure connected, the embedding structure is arranged in the installation groove and welded to the welding block, the bottom plate portion is located outside the installation groove, and the bottom plate portion is suitable for being connected to a pole ear; along the thickness direction of the battery cover plate, the thickness of the bottom plate portion is A, satisfying 1mm ≤ A ≤ 1.5mm.

[0006] Beneficial effects: By directly connecting the bottom plate portion of the pole column to the pole ear, the connection structure is simplified and the processing procedures are reduced; by limiting the thickness dimension of the bottom plate portion, on the premise of ensuring the welding quality between the pole column and the pole ear, the defective rate of the connection between the pole column and the pole ear is reduced, and the space occupied by the bottom plate portion in the battery housing is reduced.

[0007] In an optional embodiment, the embedding structure includes a welding portion and a connecting portion, both ends of the connecting portion are respectively connected to the welding portion and the bottom plate portion, the welding portion is welded to the welding block, and along the thickness direction of the battery cover plate, the thickness of the welding portion is B, satisfying 1.2mm ≤ B ≤ 1.6mm.

[0008] Beneficial effects: By limiting the thickness dimension of the welding portion, on the premise of ensuring the welding quality between the welding portion of the pole column and the welding block, the height of the pole column is reduced, and thus the overall height of the battery cover plate is reduced.

[0009] In an alternative embodiment, the thickness A of the bottom plate portion and the thickness B of the welding portion satisfy 1.2 ≤ B / A ≤ 1.5.

[0010] In an alternative embodiment, along the length direction of the battery cover plate, the length of the welding portion is D, satisfying 3.5 mm ≤ D ≤ 20 mm.

[0011] Beneficial effects: By defining the length dimension of the welding machine portion, while ensuring the overcurrent requirement of the pole column, the occupied space of the pole column in the battery is reduced.

[0012] In an alternative embodiment, the outer wall of the connecting portion is spaced from the groove wall of the installation groove, and the distance E between the outer wall of the connecting portion and the groove wall of the installation groove satisfies 0.2 mm ≤ E ≤ 0.5 mm.

[0013] Beneficial effects: By defining the distance between the outer wall of the connecting portion and the groove wall of the installation groove, while ensuring the good welding rate between the pole column and the welding block, it is convenient for the assembly of the pole column and the welding block.

[0014] In an alternative embodiment, the battery cover plate further includes an insulating member. Along the length direction of the battery cover plate, part of the welding block extends outward to form an extension portion, and the insulating member is disposed between the extension portion and the cover plate body.

[0015] Beneficial effects: By providing the insulating member, it ensures the normal operation of the internal circuit of the battery, reduces the influence on the battery system caused by external impacts or vibrations and other factors, thereby improving the safety performance of the entire battery system.

[0016] In an alternative embodiment, the battery cover plate further includes a sealing member. The sealing member is disposed in the perforation, and along the length direction of the battery cover plate, the sealing member is disposed between the cover plate body and the welding block.

[0017] Beneficial effects: By providing the sealing member, it prevents the leakage of the electrolyte in the battery, ensures the safety of the battery; at the same time, it prevents external moisture, dust, etc. from entering the battery interior.

[0018] In an alternative embodiment, along the thickness direction of the battery cover plate, the height of the pole column is C, satisfying 4 mm ≤ C ≤ 8 mm.

[0019] Beneficial effects: By defining the height dimension of the pole column, while ensuring that the sealing member has sufficient compression space, the overall height of the pole column is reduced, and then the overall height of the battery cover plate is reduced.

[0020] In an alternative embodiment, the thickness A of the bottom plate portion and the height C of the pole column satisfy 4 ≤ C / A ≤ 6.

[0021] Beneficial effects: By further defining the height of the terminal post and the thickness of the bottom plate portion, it is possible to prevent the bottom plate portion from being too high and occupying too much internal space of the battery.

[0022] In a second aspect, the present utility model also provides a battery, comprising: the above-mentioned battery cover plate; a housing, at least one end of the housing is provided with an opening, the battery cover plate is connected to the housing and seals the opening, and the housing and the battery cover plate enclose an installation cavity; a pole group, arranged in the installation cavity, the pole group includes pole tabs, and the pole tabs are connected to the bottom plate portion. Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the battery cover plate according to an embodiment of the present utility model;

[0025] Figure 2 It is a schematic structural diagram of the terminal post according to an embodiment of the present utility model;

[0026] Figure 3 It is a schematic structural diagram of the battery according to an embodiment of the present utility model.

[0027] Description of the reference numerals:

[0028] 10. Cover plate main body; 20. Welding block; 21. Extension portion; 30. Terminal post; 31. Bottom plate portion; 32. Embedding structure; 321. Welding portion; 322. Connection portion; 40. Insulating member; 41. First plastic part; 42. Second plastic part; 50. Sealing member; 60. Housing; 70. Pole group; 71. Pole tab. Detailed Embodiments

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0030] The following will be combined with Figure 1 and Figure 3, describe embodiments of the present utility model.

[0031] According to an embodiment of the present utility model, in a first aspect, a battery cover plate is provided, including a cover plate main body 10, a welding block 20, and a pole column 30. The cover plate main body 10 is provided with a through hole; the welding block 20 is disposed through the through hole, the welding block 20 is provided with an installation groove, and along the thickness direction of the battery cover plate, the installation groove penetrates through one side surface of the welding block 20; the pole column 30 includes a bottom plate portion 31 and an embedding structure 32 connected, the embedding structure 32 is disposed in the installation groove and welded to the welding block 20, the bottom plate portion 31 is located outside the installation groove, and the bottom plate portion 31 is adapted to be connected to a tab 71; along the thickness direction of the battery cover plate, the thickness of the bottom plate portion 31 is A, satisfying 1 mm ≤ A ≤ 1.5 mm.

[0032] Applying the battery cover plate of this embodiment, the bottom plate portion 31 of the pole column 30 is directly connected to the tab 71, simplifying the connection structure and reducing the processing procedures; by limiting the thickness dimension of the bottom plate portion 31, on the premise of ensuring the welding quality between the pole column 30 and the tab 71, the connection defect rate between the pole column 30 and the tab 71 is reduced, and the space occupied by the bottom plate portion 31 in the battery case 60 is reduced.

[0033] It should be noted that in the related art, the pole column 30 needs to be electrically connected to the electrode group 70 through a connecting piece. First, the pole column 30 is welded to one end of the connecting piece; then, the other end of the connecting piece is welded to the electrode group 70, that is, the pole column 30 needs two welding procedures to achieve electrical connection conduction. In this embodiment, the pole column 30 is directly connected to the tab 71 of the pole column 30 through the bottom plate portion 31, simplifying the processing steps, thereby reducing the welding defect rate.

[0034] It should be noted that when A < 1 mm, the thickness dimension of the bottom plate portion 31 is too small. Due to its relatively thin thickness, it is easier to dissipate heat, which may cause the temperature of the welding area to drop rapidly, the solder not to melt sufficiently, and pores, no explosion points, etc. are likely to occur between the bottom plate portion 31 and the tab 71, resulting in poor welding between the bottom plate portion 31 and the tab 71, and the connection strength between the bottom plate portion 31 and the tab 71 is affected; when A > 1.5 mm, the thickness dimension of the bottom plate portion 31 is too large, resulting in the height of the pole column 30 becoming higher, thus affecting the overall height of the battery and causing the battery to occupy too much space. Therefore, by limiting the thickness dimension range of the bottom plate portion 31, the welding quality between the pole column 30 and the tab 71 is ensured, the connection defect rate between the pole column 30 and the tab 71 is reduced, and the space occupied by the bottom plate portion 31 in the battery case 60 is reduced.

[0035] In one embodiment, as Figure 1 and Figure 2As shown, the embedding structure 32 includes a welding part 321 and a connecting part 322. The two ends of the connecting part 322 are respectively connected to the welding part 321 and the bottom plate part 31. The welding part 321 is welded to the welding block 20. Along the thickness direction of the battery cover plate, the thickness of the welding part 321 is B, and 1.2mm ≤ B ≤ 1.6mm is satisfied. By limiting the thickness dimension of the welding part 321, while ensuring the welding quality between the welding part 321 of the pole 30 and the welding block 20, the height of the pole 30 is reduced, and further the overall height of the battery cover plate is reduced.

[0036] Specifically, the welding part 321 and the welding block 20 are welded by penetration welding.

[0037] It should be noted that when B < 1.2mm, the thickness dimension of the welding part 321 is too small, and the bending resistance and stiffness of the welding part 321 are relatively weak, making it difficult to effectively resist the thermal stress and mechanical stress generated during the welding process. This will cause large deformations in the welding area and the surrounding area, such as bending and wavy deformation, resulting in the situation of false welding; when B > 1.6mm, the thickness dimension of the welding part 321 is too large, resulting in the increase of the height of the pole 30, thus affecting the overall height of the battery and causing the battery to occupy too much space.

[0038] In one embodiment, as Figure 1 and Figure 2 shown, the thickness A of the bottom plate part 31 and the thickness B of the welding part 321 satisfy 1.2 ≤ B / A ≤ 1.5.

[0039] It should be noted that by further limiting the thickness of the welding part 321 and the thickness of the bottom plate part 31, the thickness difference between the welding part 321 and the bottom plate part 31 is relatively small, which is beneficial to the stress distribution in the pole 30 and ensures the strength and stability of the pole 30 structure.

[0040] In one embodiment, as Figure 1 and Figure 2 shown, along the length direction of the battery cover plate, the length of the welding part 321 is D, and 3.5mm ≤ D ≤ 20mm is satisfied. By limiting the length dimension of the welding part, while ensuring the over-current requirement of the pole 30, the occupied space of the pole 30 in the battery is reduced.

[0041] It should be noted that the length of the welding part 321 determines the cross-sectional area of the pole 30, and the cross-sectional area directly affects the current density. A lower current density helps to reduce the heat generation and oxidation of the conductor, thus obtaining a higher over-current capacity.

[0042] Furthermore, the larger the cross-sectional area of the terminal post 30, the lower the current density. When D < 3.5 mm, the cross-sectional area of the terminal post 30 is relatively small, resulting in a relatively large current density of the terminal post 30, and the overcurrent capacity of the terminal post 30 is poor, failing to meet the overcurrent requirement; when D > 20 mm, the occupied space of the terminal post 30 is too large, affecting the utilization of the internal space of the battery and the performance such as the battery power.

[0043] It should be noted that a larger cross-sectional area of the terminal post 30 helps to better dissipate the heat generated by the passing current. Good heat dissipation performance can prevent the terminal post 30 from being damaged due to overheating, thereby ensuring the long-term stable operation of the battery.

[0044] In one embodiment, as Figure 1 shown, the outer wall of the connecting portion 322 is spaced from the wall of the mounting groove, and the distance between the outer wall of the connecting portion 322 and the wall of the mounting groove is E, satisfying 0.2 mm ≤ E ≤ 0.5 mm. By defining the distance between the outer wall of the connecting portion 322 and the wall of the mounting groove, while ensuring a good welding rate between the terminal post 30 and the welding block 20, it is convenient for the assembly of the terminal post 30 and the welding block 20.

[0045] It should be noted that when E < 0.2 mm, the distance between the outer wall of the connecting portion 322 and the wall of the mounting groove is relatively small. During the assembly process, the outer wall of the connecting portion 322 is prone to bumping against the wall of the mounting groove, and it is not conducive to the embedding of the connecting portion 322; when E > 0.5 mm, the coverage range of the shielding gas will be correspondingly reduced, resulting in a weakened gas protection effect in the weld area. This will increase the risk of defects such as porosity and slag inclusion in the weld, thereby reducing the welding quality.

[0046] In one embodiment, as Figure 1 shown, the battery cover plate further includes an insulating member 40. Along the length direction of the battery cover plate, a part of the welding block 20 extends outward to form an extension portion 21, and the insulating member 40 is disposed between the extension portion 21 and the cover plate main body 10. By providing the insulating member 40, it ensures the normal operation of the internal circuit of the battery, reduces the influence on the battery system due to external impacts or vibrations and other factors, thereby improving the safety performance of the entire battery system.

[0047] Specifically, the insulating member 40 includes a first plastic part 41 and a second plastic part 42.

[0048] Furthermore, along the thickness direction of the battery cover plate, there are two extension portions 21, and the two extension portions 21 are respectively disposed on the upper and lower sides of the cover plate main body 10. The first plastic part 41 is disposed between the upper extension portion 21 and the upper side surface of the cover plate main body 10, and the second plastic part 42 is disposed between the lower extension portion 21 and the lower side surface of the cover plate main body 10.

[0049] In one embodiment, as Figure 1As shown, the battery cover plate further includes a seal 50. The seal 50 is disposed in the perforation. Along the length direction of the battery cover plate, the seal 50 is disposed between the cover plate body 10 and the welding block 20. By providing the seal 50, leakage of the electrolyte in the battery is prevented to ensure battery safety; at the same time, external moisture, dust, etc. are prevented from entering the battery interior.

[0050] Specifically, the seal 50 is sleeved on the welding block 20.

[0051] In one embodiment, as Figure 1 and Figure 2 shown, the thickness A of the bottom plate portion 31 and the height C of the pole post 30 satisfy 4 mm ≤ C ≤ 8 mm. By limiting the height dimension of the pole post 30, while ensuring that the seal 50 has sufficient compression space, the overall height of the pole post 30 is reduced, and thus the overall height of the battery cover plate is reduced.

[0052] It should be noted that on the basis of considering the dimensions of the welding portion 321 and the bottom plate portion 31, when C < 4 mm, the overall height of the pole post 30 is relatively low, resulting in a relatively low height of the connecting portion 322, thereby resulting in a relatively small compression space for the seal 50. When the compression space is small, the seal 50 is easily squeezed against other structures during compression, which easily causes deformation of other structures and poses a safety hazard; when C > 8 mm, the overall height of the pole post 30 is too high, resulting in a relatively high height of the battery cover plate and the overall height of the battery, and the battery occupies too large an area, affecting the space utilization rate of the battery.

[0053] In one embodiment, as Figure 1 and Figure 2 shown, along the thickness direction of the battery cover plate, the height of the pole post 30 is C, satisfying 4 ≤ C / A ≤ 6. By further limiting the height of the pole post 30 and the thickness of the bottom plate portion 31, the bottom plate portion 31 is prevented from being too high and from occupying too much internal space of the battery.

[0054] It should be noted that the bottom plate portion 31 is integrally disposed inside the housing 60 of the battery. The height of the bottom plate portion 31 affects the size of the space occupied by the battery cover plate inside the housing 60 of the battery. Therefore, the height of the bottom plate portion 31 is further limited according to the height of the pole post 30, thereby preventing the bottom plate portion 31 from occupying too much internal space of the battery.

[0055] According to an embodiment of the present invention, in a second aspect, there is also provided a battery, including the above-mentioned battery cover plate, a housing 60, and a pole group 70. At least one end of the housing 60 is provided with an opening. The battery cover plate is connected to the housing 60 and seals the opening. The housing 60 and the battery cover plate enclose an installation cavity; the pole group 70 is disposed in the installation cavity, and the pole group 70 includes a pole ear 71, and the pole ear 71 is connected to the bottom plate portion 31.

[0056] Specifically, please refer toFigure 3 , one end of the housing 60 is provided with an opening, the electrode group 70 is arranged inside the housing 60, the electrode tab 71 is directly connected to the bottom plate portion 31 of the battery cover plate, and the battery cover plate is connected to the housing 60 to seal the housing 60.

[0057] Of course, in other alternative embodiments, openings may also be provided at both ends of the housing 60, two battery cover plates are provided, and the two battery cover plates are respectively arranged corresponding to the two openings.

[0058] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A battery cover plate, characterized in that, Comprising: A cover plate main body, in which a perforation is formed. A welding block, which penetrates through the perforation. An installation groove is formed in the welding block, and along the thickness direction of the battery cover plate, the installation groove penetrates through one side surface of the welding block. A pole post, including a bottom plate portion and an embedding structure connected to each other. The embedding structure is arranged in the installation groove and welded to the welding block. The bottom plate portion is located outside the installation groove and is adapted to be connected to a tab. Along the thickness direction of the battery cover plate, the thickness of the bottom plate portion is A, satisfying 1mm ≤ A ≤ 1.5mm.

2. The battery cover plate according to claim 1, characterized in that, The embedding structure includes a welding portion and a connecting portion. Two ends of the connecting portion are respectively connected to the welding portion and the bottom plate portion. The welding portion is welded to the welding block. Along the thickness direction of the battery cover plate, the thickness of the welding portion is B, satisfying 1.2mm ≤ B ≤ 1.6mm.

3. The battery cover plate according to claim 2, characterized in that, The thickness A of the bottom plate portion and the thickness B of the welding portion satisfy 1.2 ≤ B / A ≤ 1.

5.

4. The battery cover plate according to claim 2, characterized in that, Along the length direction of the battery cover plate, the length of the welding portion is D, satisfying 3.5mm ≤ D ≤ 20mm.

5. The battery cover plate according to claim 2, characterized in that The outer wall of the connecting portion is spaced from the groove wall of the installation groove, and the distance between the connecting portion and the groove wall of the installation groove is E, satisfying 0.2mm ≤ E ≤ 0.5mm.

6. The battery cover plate according to any one of claims 2-5, characterized in that, The battery cover plate further includes an insulating member. Along the length direction of the battery cover plate, a part of the welding block extends outward to form an extension portion, and the insulating member is arranged between the extension portion and the cover plate main body.

7. The battery cover plate according to any one of claims 2-5, characterized in that, The battery cover plate further includes a sealing member, which is arranged in the perforation. Along the length direction of the battery cover plate, the sealing member is arranged between the cover plate main body and the welding block.

8. The battery cover plate according to claim 7, wherein, Along the thickness direction of the battery cover plate, the height of the pole post is C, satisfying 4mm ≤ C ≤ 8mm.

9. The battery cover plate according to claim 8, characterized in that, The thickness A of the bottom plate portion and the height C of the pole post satisfy 4 ≤ C / A ≤ 6.

10. A battery, characterized in that, Comprising: The battery cover plate according to any one of claims 1 to 9; A housing, at least one end of which is provided with an opening. The battery cover plate is connected to the housing and seals the opening, and an installation cavity is formed by enclosing the housing and the battery cover plate. A pole group, which is arranged in the installation cavity. The pole group includes tabs, and the tabs are connected to the bottom plate portion.

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